Facile synthesis of ZnWO4 nanowall arrays on Ni foam for high performance supercapacitors
Facile synthesis of ZnWO4 nanowall arrays on Ni foam for high performance supercapacitors
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在泡沫镍上轻松合成 ZnWO4 纳米墙阵列，用于高性能超级电容器
DOI：
10.1039/c3ra45866k
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发表时间：
2014-01-01
期刊：
影响因子：
3.9
通讯作者：
Li, Qiuhong
中科院分区：
文献类型：
--
作者：
Guan, Bingkun;Hu, Lingling;Li, Qiuhong
本文采用水热法在泡沫镍衬底上生长了ZnWO4纳米墙阵列，并首次研究其在超级电容器中的应用。用X-射线衍射谱、扫描电子显微镜和透射电子显微镜对产物进行了分析。在充放电电流密度为20 mA cm(-2)(1250Fg(-1)，电流密度为10Ag(-1)时，其比电容为2.5F cm(-2))。此外，它们在100 mA cm(-2)以下的不同电流密度下表现出良好的循环能力，4000次循环后仍保持92%(2.3F cm(-2))的初始电容。直接在集电体上生长的由相互连接的ZnWO4 NWAs组成的开放式网络结构有利于电子的传输和电解液的扩散，从而促进了电化学反应。我们的工作不仅证明了一种简便的水热方法直接在泡沫镍上生长ZnWO4纳米晶，而且还揭示了ZnWO4是一种很有前途的高性能超级电容器电极。
In this report, ZnWO4 nanowall arrays (NWAs) were grown on Ni foam by a hydrothermal route and investigated for application in supercapacitors for the first time. The resulting NWAs were analyzed by using X-ray diffraction spectroscopy, scanning electron microscopy, and transmission electron microscopy. ZnWO4 NWAs exhibited high electrochemical property with a specific capacitance of 2.5 F cm(-2) at a charge and discharge current density of 20 mA cm(-2) (1250 F g(-1) at current density of 10 A g(-1)). Furthermore, they showed an excellent cycling ability at different current densities up to 100 mA cm(-2), and 92% (2.3 F cm(-2)) of the initial capacitance remained after 4000 cycles. The open network structure consisting of interconnected ZnWO4 NWAs directly grown on current collectors is advantageous for electron transport and electrolyte diffusion which can facilitate the electrochemical reaction. Our work not only demonstrated a facile hydrothermal method for ZnWO4 NWAs directly grown on Ni foam, but also revealed ZnWO4 to be a promising electrode for high-property supercapacitors.